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US 5,750,222 AGranted
Seamless can with necked-in portion
AssigneeToyo Seikan Kaisya, Ltd.
InventorsIkuo Komatsu, Nobuyuki Sato, Katsuhiro Imazu
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AssigneeToyo Seikan Kaisya, Ltd.
InventorsIkuo Komatsu, Nobuyuki Sato, Katsuhiro Imazu
Estimating the term…
An organic resin-coated seamless can with necked-in portion is disclosed, which is produced by subjecting a resin-coated steel sheet to drawing-re-drawing for reducing thickness or to drawing-re-drawing-ironing for reducing thickness-ironing and which has a ratio of diameter of necked-in portion to diameter of body of 0.9 or less than that, said steel sheet being coated by 5- to 30-.mu.m thick organic resin layer on both surfaces of aluminum-killed, surface-treated steel sheet of 0.01 to 0.13 % by weight in total carbon amount and not more than 6.5 .mu.m in average grain diameter having been subjected to over-aging after continuous annealing to adjust to not more than 10 ppm in solid-dissolved carbon amount. This can scarcely has rough surface or pinholes in the necked-in portion even when the necked-in portion has been considerably compressed upon its formation.
An organic resin-coated seamless can with necked-in portion, which is produced by subjecting a resin-coated steel sheet to drawing-re-drawing for reducing thickness or to drawing-re-drawing-ironing for reducing thickness and which has a ratio of diameter of necked-in portion to diameter of body of 0.9 or less, said steel sheet being coated by 5- to 30-.mu.m thick organic resin layer on both surfaces of aluminum-killed, surface treated steel sheet of 0.01 to 0.13% by weight in total carbon amount and not more than 6.5 .mu.m in average grain diameter having been subjected to over-aging at 350.degree.-500.degree. C. after continuous annealing to adjust to not more than 10 ppm in solid-dissolved carbon amount and a nitrogen content not exceeding 0.006% by weight.
Dependencies are inferred from the claim text.